Which configuration setting helps in determining the size of cached history data?

The configuration setting that determines the size of cached history data is the HistoryCacheSize. This setting specifically governs how much historical data can be stored in memory, allowing for efficient retrieval without the need to constantly access disk storage. This is crucial for optimizing data access speeds and enhancing overall system performance, as it reduces latency when querying historical data.

On the other hand, BlockSize typically refers to the size of individual data blocks for storage rather than the total cache size. MaxConnections indicates the limit on the number of simultaneous client connections to the server, impacting the system's ability to handle multiple requests but not directly related to data caching. AccessFrequency may relate to how often data is accessed, but it does not define the capacity of the cache itself. By focusing on HistoryCacheSize, users can ensure they have sufficient memory set aside for quick access to historical data, facilitating smoother operations within the AVEVA Historian environment.